text: /*
   * Copyright 2017 Google
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #import <Foundation/Foundation.h>
  
  @class FSTMaybeDocument;
  
  NS_ASSUME_NONNULL_BEGIN
  
  /**
   * FSTVoidBlock is a block that's called when a specific event happens but that otherwise has
   * no information associated with it.
   */
  typedef void (^FSTVoidBlock)(void);
  
  /**
   * FSTVoidErrorBlock is a block that gets an error, if one occurred.
   *
   * @param error The error if it occurred, or nil.
   */
  typedef void (^FSTVoidErrorBlock)(NSError *_Nullable error);
  
  /**
   * FSTVoidMaybeDocumentErrorBlock is a block that gets either a list of documents or an error.
   *
   * @param documents The documents, if no error occurred, or nil.
   * @param error The error, if one occurred, or nil.
   */
  typedef void (^FSTVoidMaybeDocumentArrayErrorBlock)(
      NSArray<FSTMaybeDocument *> *_Nullable documents, NSError *_Nullable error);
  
  NS_ASSUME_NONNULL_END
  